Fault Location Technology of Transmission Line based on Asynchronous Phasor Measurement from PMUs

Abstract

Abstract With the continuous expansion of the scale of the modern power system, when the fault occurs at transmission networks, it will have a serious impact on the economy and people’s life. In this paper, a fault location method based on synchronous phasor measurement from the phasor measurement unit (PMU) is proposed in transmission networks. Firstly, the real-time synchronous voltage and current phasors of the transmission lines are measured by the PMU at two buses. Then, the characteristic impedance and propagation coefficient of the line is calculated according to the measurement phasors, and the fault point voltage is listed at both ends of the line. Finally, the fault distance is obtained by solving the complex equation under fault condition at both ends to realize the fault location of transmission networks without branches. Compared with the single-terminal fault location method, the proposed method can eliminate the errors caused by various factors, such as the uneven distribution of capacitance and the uncertain transition resistance. At the same time, this paper uses PSACD software to build a model to verify the effectiveness and superiority of the method.